
const S4 = function() {
  return (((1 + Math.random()) * 0x10000) | 0).toString(16).substring(1);
};
export function guid() {
  return (S4() + S4() +'-' +S4() +'-' +S4() +'-' +S4() +'-' +S4() +S4() +S4()
  );
}

